- Aaronsburg
- Aaronsburg
- Abbottstown
- Abington
- Acme
- Acosta
- Adah
- Adams
- Adams
- Adams
- Adamsburg
- Adamstown
- Addison
- Addison Township
- Airville
- Akron
- Albany
- Albany
- Albion
- Albrightsville
- Alburtis
- Alburtis
- Aldan
- Aleppo
- Aliquippa
- Allegheny
- Allegheny
- Allegheny
- Allegheny
- Allegheny
- Allen
- Allenport
- Allentown
- Allison
- Allison Park
- Almedia
- Alsace
- Alsace Manor
- Altamont
- Altoona
- Ambler
- Ambridge
- Amity
- Amity
- Amity
- Amity Gardens
- Amwell
- Ancient Oaks
- Andreas
- Annville
- Antis
- Antrim
- Apolacon
- Apollo
- Apollo
- Ararat
- Archbald
- Ardara
- Ardmore
- Arendtsville
- Arlington Heights
- Armagh
- Armenia
- Armstrong
- Arnold
- Artemas
- Ashland
- Ashland
- Ashley
- Aspers
- Aspinwall
- Aston
- Asylum
- Atglen
- Athens
- Athens
- Athens Township
- Atlas
- Atlasburg
- Auburn
- Auburn
- Audubon
- Austin
- Avalon
- Avella
- Avoca
- Avon
- Avondale
- Avonia
- Avonmore
- Ayr